Questions and Answers

Posted May 05, 2008

Q: The pressure gauge on my sealed central heating system has gradually fallen from 2 bar to 1 bar. Is this normal and what should I do to bring the pressure back up again. Frankie

A: Somewhere on your system there is a filling loop - a connection between the closed, pressurised heating system and the water main. This is usually either a flexible pipe with a valve (or several valves) on it just underneath your boiler, or an actual valve on the boiler itself. If you can see nothing obvious on the system, get a heating engineer out and ask them to show you how to do it - it's always better to be safe when dealing with central heating. Your system is pretty safe until it drops below 0.8 - values between 0.8 and 1.5 are usual.

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